where the difference between these URLs is the metadata and download options. Use the metadata option to verify the build before downloading it. Use the download option to download the package in a single step.

pv is the platform version. Possible values depend on the platform. For example, Ubuntu: 10.10, 11.04, 11.10, 12.04, or 12.10 or for Mac OS X: 10.6 or 10.7.

m is the machine architecture for the machine on which the product will be installed. Possible values depend on the platform. For example, for Ubuntu or Debian: i386 or x86_64 or for Mac OS X: x86_64.

v is the version of the product to be installed. A version always takes the form x.y.z, where x, y, and z are decimal numbers that are used to represent major (x), minor (y), and patch (z) versions. One-part (x) and two-part (x.y) versions are allowed. For more information about application versioning, see http://semver.org/. Default value: latest.